Piezocatalysis triggered by ultrasonic vibration has emerged as an effective strategy to address the widespread environmental challenges and human health concerns. Nevertheless, the pursuit of high-performance piezoelectrics that can simultaneously realize catalysis and biotherapy still poses a significant challenge. Herein, we report a notable enhancement in piezocatalytic performance of BaTiO 3 nanoplates featuring highly exposed {001} facets. By controlling the exposure of polar facets, BaTiO 3 with highly {001} facets (I {001} /I {110} = 4.17) exhibits an impressive 1500 % improvement in degradation efficiency compared to BaTiO 3 with less-exposed {001} facets (I {001} /I {110} = 0.76). Through in vitro ultrasonic stimulation, BaTiO 3 also demonstrates a remarkable ability to regenerate neurons, facilitating the rapid differentiation of neural progenitor cells into mature neurons. The mechanism of how polar facets enhance the piezocatalytic activity is systematically investigated by finite element method (FEM) simulation and density functional theory (DFT) calculations, revealing that the enhancement stems from the abundant active sites and strong charge transfer ability. This study thus offers a comprehensive understanding of the relationship between polar facets and piezocatalytic performance, also providing inspiration for the development of high-performance piezoelectric medicine for nerve repair.
Jingjing Shi,Ibrahim Ul Islam,Wenpeng Chen,Fengming Wang,Zhiyuan Xu,Shihong Xu,Yanmei Li,Jun Lu
Two-dimensional ultrathin Zn x Cd 1-x S nanosheet was fabricated by topotactic sulfurization process using trimetallic ZnCdAl layered double hydroxides (LDHs) as precursor and thiourea as sulfur source. A series of characterizations were conducted to investigate the structure and properties of Zn x Cd 1-x S nanosheet. The band gap engineering of Zn x Cd 1-x S nanosheet can be tuned by the composition of LDH precursor, keeping balance between photo-absorption ability and flat band potential. Zn x Cd 1-x S nanosheet possessed exposed (111)ZB or (002)WZ polar facet. Zn 0.67 Cd 0.33 S nanosheet displayed not only the highest photocatalytic hydrogen-generation activity under visible light irradiation (6.69 mmol h −1 g −1 ) without cocatalyst , but also outstanding stability after several cycles. In spite of the poor surface area of the nanosheet, it can be concluded that the carrier separation and transport rate of Zn x Cd 1-x S nanosheet significantly enhanced, rendering photogenerated carriers transport across the polar facet. This can be attributed to the photogenerated electron/hole exclusively delocalized distributed on the metal/sulfur ions, respectively. This work presents a strategy to fabricate highly efficient Zn x Cd 1-x S nanosheet from LDH precursor, which is a simple, low-cost and environmentally friendly process.
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